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3 years ago

How many ways can 7 books be arranged on a shelf 5 at a time?

Mathematics

1 answer:

aliya0001 [1]3 years ago

5 0

Symbolically, write this:

C
7 5. Know how to evaluate that?

C stands for "combination."

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How many acute angles are in an acute triangle?

Leokris [45]

Answer:

Three acute angles.

Explanation:

There are always three acute angles in an acute triangle.

8 0

3 years ago

Please please please help asap

blondinia [14]

Answer:

The answer is 22 cards are left in the stack.

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

What multiplication expression is equal to 3/4 divided by 1/3

kakasveta [241]

Answer:

3 * 3

4 1

Step-by-step explanation:

To convert division problems with fraction into multiplication problems use the KCF rule

Keep the 1st Fraction the same
Change the division sign to a multiplication sign
Flip the fraction (reciprocal)

5 0

3 years ago

Very confusing i know

777dan777 [17]

Answer:

(x + 10)² + (y + 4)² = 232

Step-by-step explanation:

<h3>Given </h3>

Center = (-10, -4)
Point on circle = (4, 2)

The equation of circle

<h3>Solution</h3>

Remember the standard equation of circle:

(x - h)² + (y - k)² = r², where (h, k) is the center and r is radius

We have

h = -10, k = -4

Use distance formula (Pythagorean theorem) to work out the length of the radius. We know that radius is the distance from the center to any point on the circle.

Here we are finding the distance between points (-10, -4) and (4, 2)

r² = (-10 - 4)² + (-4 - 2)²
r² = 14² + 6²
r² = 232

So the equation is:

(x + 10)² + (y + 4)² = 232

7 0

3 years ago

Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study wa

4vir4ik [10]

Using the z-distribution, it is found that since the test statistic is greater than the critical value, it can be concluded that the mean length of jail time has increased.

At the null hypothesis, it is tested if the mean length of jail time is still of 2.5 years, that is:

$H_0: \mu = 2.5$

At the alternative hypothesis, it is tested if it has increased, that is:

$H_1: \mu > 2.5$

We have the standard deviation for the population, thus, the z-distribution is used. The test statistic is given by:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

The parameters are:

$\overline{x}$ is the sample mean.
$\mu$ is the value tested at the null hypothesis.
$\sigma$ is the standard deviation of the sample.
n is the sample size.

For this problem, the values of the parameters are: $\overline{x} = 3, \mu = 2.5, \sigma = 1.5, n = 26$

Hence, the value of the test statistic is:

$z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{3 - 2.5}{\frac{1.5}{\sqrt{26}}}$

$z = 1.7$

The critical value for a right-tailed test, as we are testing if the mean is greater than a value, with a significance level of 0.05, is of $z^{\ast} = 1.645$

Since the test statistic is greater than the critical value, it can be concluded that the mean length of jail time has increased.

A similar problem is given at brainly.com/question/24166849

5 0

3 years ago